Area of the Circle Using a Function in Pascal

 A program that will ask the user to give radius and then the program compute the area of the circle using a function in pascal programming language.

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Program Listing
program AreaOfCircle;


function CalculateArea(radius: Double): Double;
const
  PI = 3.14159; // defining the value of pi
begin
  CalculateArea := PI * radius * radius; // calculating the area of the circle
end;

var
  radius, area: Double;

begin
  writeln;
  write('Area of a Circle Using Functions in Pascal');
  writeln;
  Write('Enter the radius of the circle: ');
  ReadLn(radius);

  // calling the function to calculate the area of the circle
  area := CalculateArea(radius);

  WriteLn('The area of the circle with radius ', radius:0:2, ' is ', area:0:2, '.');
  writeln;
  write('End of Program');
  writeln;
end.